Year | Value | 2021 | 81.250912038914 | 2020 | 79.39197405756 | 2019 | 77.178759627077 | 2018 | 79.002837454398 | 2017 | 81.272800972841 | 2016 | 81.272800972841 | 2015 | 81.3538710985 | 2014 | 81.313336035671 | 2013 | 80.259424402108 | 2012 | 79.408188082691 | 2011 | 78.759627077422 | 2010 | 77.908390758006 | 2009 | 77.259829752736 | 2008 | 76.205918119173 | 2007 | 76.124847993514 | 2006 | 76.368058370491 | 2005 | 76.246453182002 | 2004 | 76.327523307661 | 2003 | 76.449128496149 | 2002 | 76.530198621808 | 2001 | 76.895014187272 | 2000 | 74.017024726388 | 1999 | 69.598702877989 | 1998 | 67.734089987839 | 1997 | 66.923388731253 | 1996 | 64.896635589785 | 1995 | 62.829347385488 | 1994 | 62.829347385488 | 1993 | 71.139035265505 | 1992 | 74.381840291852 | 1991 | 76.003242805026 | 1990 | 76.124847993514 | 1989 | 75.15200648561 | 1988 | 75.111471422781 | 1987 | 74.665585731658 | 1986 | 74.179164977706 | 1985 | 73.733279286583 | 1984 | 73.28739359546 | 1983 | 72.557762464532 | 1982 | 71.949736522092 | 1981 | 71.341710579651 | 1980 | 69.517632752331 | 1979 | 68.788001621403 | 1978 | 68.098905553304 | 1977 | 67.490879610863 | 1976 | 66.4369679773 | 1975 | 65.342521280908 | 1974 | 64.207539521686 | 1973 | 61.005269558168 | 1972 | 61.126874746656 | 1971 | 58.694770976895 | 1970 | 56.911228212404 | 1969 | 56.627482772598 | 1968 | 56.059991892987 | 1967 | 55.735711390353 | 1966 | 55.330360762059 | 1965 | 54.925010133766 | 1964 | 54.519659505472 | 1963 | 54.114308877179 | 1962 | 53.708958248885 | 1961 | 53.303607620592 |
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